Subordinate conjunction

A. Sometimes I got a new puppy, I have been responsible lately.
B. I got a new puppy, I have been responsible lately.
C. I got a new puppy if I have been responsible lately.
D. I got a new puppy because I have been responsible lately.

Respuesta :

It is D since "Because" is a Subordinate conjunction.
Alvena
D, it makes better sense